When it comes to Xavi I must admit one thing especially. In his control the players started to show much better performances. I still remember that horrible time period with Koeman. 
Barcelona were in serious pain back then. After Xavi came they even won a La Liga title but things aren't just going the way he would like now.
There have been serious defensive vulnerabilities and this is very likely to cost them the league title. I didn't expect Xavi to make such announcement this early honestly. I thought he would give it one more chance while the board were still believing in him. If he doesn't change his mind then I'm curious who their next manager will be.
Barcelona were in serious pain back then. After Xavi came they even won a La Liga title but things aren't just going the way he would like now.There have been serious defensive vulnerabilities and this is very likely to cost them the league title. I didn't expect Xavi to make such announcement this early honestly. I thought he would give it one more chance while the board were still believing in him. If he doesn't change his mind then I'm curious who their next manager will be.
Xavi is too loyal to be Barcelona coach and because of that, I think it was the right decision for Xavi to resign. Because anyway, the financial crisis that Barcelona is going through is really having a bad impact on the management of the team and also the performance of the team. So yes, although there will be a transfer window that will open later but still, it is difficult for Barcelona to be able to build a team with great players in the upcoming transfer window. So yes, even if Xavi stays at Barcelona but if Barcelona financial situation is still bad then of course, it is difficult for Xavi to improve the quality of Barcelona and it will never be easy to make Barcelona strong again in the title race.